A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Tony Oz
Date: 2018 Apr 3, 10:28 -0700
May be I misunderstood you.
I think that the gravitation propagates with the speed of light. IMHO this means the the body - for all practical purposes - is there where you see it now, just measure its altitude, azimuth, hour angle, etc.